The phrase "opening goal" refers to the first point or score that is made in a game or competition. It sets the tone for the rest of the game and can be an important advantage for a team or player. Full definition
It was he who created, and scored, the game's opening goal in the 17th minute. (skysports.com)
If you write them correctly, they will open the goal of your document and the structure. (star-writers.com)
They are lacking a bit of punch going forward though as they have scored just four opening goals at home this season in their fixtures. (football-bookmakers.com)